I continue to mess about with these techniques. It seems a bit less like 'painting' and more like a chemistry experiment. Oh well, it's fun. I really like the texture the canvas adds to the black in the two pieces below. Almost like that experiment in grade school when you run a magnet underneath a sheet of paper with metal filings on it.

As it stands, this is a series of three. I might add a few more, however.

After producing the first one (top image) someone told me it reminded them of the diving spot off the coast of Belize called The Blue Hole. So that's where the name comes from, in case you were wondering.